Leases- Schedule of Operating and Finance Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
ROU assets:
Operating leases	$ 366	$ 64
Finance leases	$ 7	$ 4
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Premises and equipment, net	Premises and equipment, net
Total leased assets	$ 373	$ 68
Lease liabilities:
Operating leases	$ 373	$ 64
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Finance leases	$ 8	$ 4
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Borrowings	Other Borrowings
Total lease liabilities	$ 381	$ 68
Weighted Average Remaining Lease Term [Abstract]
Weighted average remaining lease term, operating	9 years 7 months 6 days	8 years 10 months 24 days
Weighted average remaining lease term, finance	4 years 4 months 24 days	3 years 6 months
Weighted Average Discount Rate [Abstract]
Weighted average discount rate, operating lease	2.13%	3.00%
Weighted average discount rate, finance lease	2.34%	3.12%